I believe the repeater has three RF power levels: 5w Low, 20w Mid, 50w High. Current guidance from Yaesu is not to operate the repeater at the high power setting. That's probably recommend for a non-climate controlled and /or heavy duty cycle environment. If it's currently running at mid with no problem, it may be possible to access the alignment mode, back the high power setting down to 30-35 watts, and operate it there will no excessive heat/final issues. Since the repeater is basically a dual band mobile w/fan, it shouldn't have issues pushing a 35 watt VHF signal for reasonable extended periods.
With regard to amplifiers, bumping a signal from 5-35 can be done relatively cheap. A small Mirage B-34 would fill that requirement perfectly.
I was also wondering if there is a more wattage output amp for the repeater that would compensate for putting some cavities on the 146.685. Still run 5 watt input but maintain about 35-40 watts out. Just thinking about different things to do.
Post by Eric KEØATR on Feb 25, 2016 14:40:37 GMT -6
If cavities are being considered, I think that it would be important to figure that out first. If a good BpBr duplexer is used for the cavities, then we should be able to do both Tx and Rx from the top antenna, as opposed to a split system. That would give our Tx out some loss from the BpBr duplexer, but an additional 100ft of height on the Tx antenna. I really fell like we would benefit greatly from both an amp and BpBr duplexer. If we had to pick only one, my vote would be for a filtering system(specifically a BpBr setup) to help with the poor receiver selectivity our new repeater has vs our old Motorola one. Adding just and amp might just cause more desense and intermod.